Method of preoperative planning to correct spine misalignment of a patient
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Publication Number
US-11141221-B2
Publication Date
2021-10-12
Expiration Date
Abstract
This invention relates to a method of preoperative planning to correct spine misalignment of a patient, comprising a step of making a translation and a rotation, in a sagittal plane, of each vertebra of a set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set of imaged vertebrae presents afterwards, in the sagittal plane, the same cervical lordosis and/or the same thoracic kyphosis and/or the same lumbar lordosis as a model adapted for said patient, wherein it also comprises, before said step of making said translation and said rotation in a sagittal plane: a step of making a translation and a rotation, in a coronal plane, of each vertebra of said set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set of imaged vertebrae becomes straight in said coronal plane, and of making a rotation, in an axial plane, of each vertebra of said set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set of imaged vertebrae becomes axially aligned.
Core Innovation
The invention relates to a method of preoperative planning to correct spine misalignment of a patient. It performs a translation and a rotation in a sagittal plane of each vertebra of a set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that the set of imaged vertebrae presents, in the sagittal plane, the same cervical lordosis and/or the same thoracic kyphosis and/or the same lumbar lordosis as a model adapted for said patient.
Before the sagittal-plane step, the method comprises a translation and a rotation in a coronal plane of each vertebra of said set, so that the set becomes straight in said coronal plane. In addition, before the sagittal-plane step, it comprises a rotation in an axial plane of each vertebra of said set, so that the set becomes axially aligned.
The coronal and axial derotation/alignment steps support more precise determination of a corresponding pre-shaped/pre-twisted rod’s length and curvature location, aiming to avoid empirical re-twisting during surgery. The planning further includes a sagittal curvature adjustment using markers and discusses 3D reconstruction from 2D radiographs with patient-parameter-based model adaptation including pelvic incidence, population type, and patient age.
Claims Coverage
The provided claims include two independent claims. The inventive coverage consists of coordinated coronal, axial, and sagittal geometric transformations of imaged cervical/thoracic/lumbar vertebrae relative to a model adapted for the patient, with one independent claim also requiring pre-twisting of an integrated rod based on the transformed vertebral positions and orientations.
Patient-adapted sagittal translation and rotation of imaged vertebrae
A step of making a translation and a rotation, in a sagittal plane, of each vertebra of a set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set of imaged vertebrae presents afterwards, in the sagittal plane, the same cervical lordosis and/or the same thoracic kyphosis and/or the same lumbar lordosis as a model adapted for said patient.
Coronal-plane straightening of imaged vertebrae
Before said step of making said translation and said rotation in said sagittal plane, a step of making a translation and a rotation, in a coronal plane, of each vertebra of said set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set becomes straight in said coronal plane.
Axial-plane alignment of imaged vertebrae
Before said step of making said translation and said rotation in said sagittal plane, a step of making a rotation, in an axial plane, of each vertebra of said set of several cervical and/or thoracic and/or lumbar imaged spine vertebrae, so that said set becomes axially aligned.
Pre-twisting of an integrated rod based on transformed vertebral position and orientation
After said steps of making translations and rotations, a step of pre-twisting at least one rod, to be integrated within said patient body to support said patient spine, according to position and orientation of said set of several cervical and/or thoracic and/or lumbar imaged vertebrae after said step of making said translation and said rotation in said sagittal plane.
The independent claims require a preoperative planning method in which imaged cervical/thoracic/lumbar vertebrae are first translated and rotated in the coronal plane to become straight and rotated in the axial plane to become axially aligned, and then translated and rotated in the sagittal plane to match model-adapted cervical lordosis and/or thoracic kyphosis and/or lumbar lordosis; one independent claim further includes pre-twisting at least one surgically integrated rod based on the post-sagittal transformed vertebral position and orientation.
Stated Advantages
Enables more precise determination of a corresponding pre-shaped/pre-twisted rod’s length and curvature location.
Aims to avoid empirical re-twisting during surgery.
Documented Applications
Preoperative planning to correct spine misalignment in a patient with cervical lordosis and/or thoracic kyphosis and/or lumbar lordosis using coronal- and axial-plane straightening/alignment plus sagittal-plane curvature adjustment.
Planning workflows for rod length/curvature location determination for a pre-twisted or pre-shaped rod to support the patient spine.
3D reconstruction from 2D radiographic images used to support the described preoperative planning and patient-parameter-based model adaptation.
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